We had a recipe conversion last year
with Fimo to increase the stability in storage and in order to
reach a saving of energy for our customers. Therefore the
hardening temperature for the "new" Fimo is now 110°
C / 230° F. It will be no problem if you want to combine
(mix) "older" Fimo (130° C/265° F) with the
new Fimo (110° C / 230° F). We advise to harden
the combined Fimo at a temperature of 110° C (230° F)
for 30 minutes and to use an oven thermometer for checking the
temperature in your oven.

If you have any further question please
do not hesitate to contact us.

This is the answer I received from
Eberhard Faber to the other
questions I asked:

Dear Mary,

you find the answers to your questions
following:

1. You must harden the Fimo with this
temperature, which is described
on the packing.

2. You can combine (mixing) the "new" and the "old"
Fimo in each
percentage (not only 50:50). Then you can harden the combined
Fimo at
110° C / 230° F. We recommend to use an oven thermometer
to check the temperature
because Fimo soft is normally not brittle and easily cracking
(temperature to high?).

3. 350° F is a security advice. You should harden Fimo only
with the
recommended temperature. At temperatures above 350° F gases
can
result which can be harmful to health.

4. The formula for Fimo classic and "Doll Fimo" has
been changed also.